Vaccines starting with certain professions, vulnerable people and working their way to larger numbers of people.
Continued measures to reduce the spread. Physical distancing, masks.
Continued public health measures such as closing higher risk businesses and activities. These can be phased out over time.
Warmer weather toward spring making it easier to do things outdoors.
The natural immunities of younger and healthier people as more vulnerable people start to get vaccinated. Also, maybe, the immunity of people who have already been exposed and recovered.
Better testing and treatments.
The Joe Biden Presidency. I think that will also be a benefit in coordination of things at the national level.